Article summary
Giving compliments is one of the lowest-cost, highest-return social habits you can build. Research shows it boosts mood, deepens relationships and even rewires how you see the people around you.
The science behind why a few kind words change everything
Julia had been dreading her shift at the drive-through for months. The ding in her earpiece, the smoke-stale cars, the customers who changed their order three times and then yelled at her. One morning, with nothing to lose, she made herself a small, private rule: say something genuine to every person who pulled up to her window.
Most people blinked, as if the words had arrived from somewhere unexpected. Then they answered. A two-sentence exchange about where she’d bought that shirt or which nail salon did that design. By the end of her shift, something else also shifted. Not in the customers, who were exactly the same people they’d always been, but in Julia. She went home happy for the first time in months.
That shift maps almost exactly onto what researchers have since documented in controlled studies. Giving compliments doesn’t just benefit the person receiving them. It rewires the giver.
Your brain on a compliment
The underlying neuroscience is more striking than most people expect.
In 2008, neuroscientist Norihiro Sadato and colleagues used fMRI imaging to compare what happens in the brain when a person receives money versus when they receive a compliment. The result was that both activate the striatum, the brain’s primary reward centre, in nearly identical ways. A kind word, processed correctly, feels like a windfall.
A follow-up study found that this same striatal activation boosts skill consolidation during sleep. Participants who were praised after learning a motor task performed better the next day than unpraised participants. Compliments, it turns out, help people learn while they sleep.
The chemistry behind the sensation is dopamine. Both giving and receiving compliments trigger its release, which explains the mood lift that tends to follow genuine praise. That lift belongs to the giver too, not just the recipient.
The gap between what you fear and what happens
Most people know, somewhere, that compliments are appreciated. Yet they still hold back.
Cornell social psychologist Vanessa Bohns studied this gap in a series of experiments. In her first study, participants were sent out to give a compliment about someone’s clothing to a stranger on campus. Something like “I like your shirt.” Before going, they predicted how positively the stranger would feel and how uncomfortable it would be. They got both wrong by a wide margin.
Compliment-givers significantly underestimated how good the receiver would feel, and they dramatically overestimated how bothered or uncomfortable the receiver would be. In a follow-up study, even after watching strangers react positively to their compliments in real time, the givers still underestimated the impact.
The anxiety about giving, it turns out, is a poor predictor of the actual experience. Bohns’s team also found that people in a better mood after delivering a compliment reported they’d be more likely to approach strangers with one in the future. The action corrects the fear.
The clumsy delivery most people worry about matters far less than they assume. Recipients care that someone noticed them, not that the phrasing was polished.
Where compliments work the best
At work
The workplace offers a clear test case for how compliments scale.
A study found that verbal praise outperforms cash bonuses as a motivator for workers. That result parallels Sadato’s fMRI findings that the brain doesn’t sharply distinguish between social and monetary reward. What changes is memory. Cash gets absorbed into a budget, but a specific, well-timed compliment stays.
A manager who says “The way you restructured that slide deck made the whole argument land” is doing something the bonus check cannot. She’s telling the recipient exactly what behaviour is worth repeating. The specificity is most important. Vague praise (“great job”) gets discounted quickly. Precise praise anchors a behaviour.
Compliments in academic and professional settings are one of the most reliable ways to build what psychologists call self-efficacy — the belief that you’re capable of doing the thing in front of you. An established researcher who sends an email to say a junior colleague’s paper changed how they thought about a problem isn’t just being friendly. They’re building capacity.
With children
Children respond to specific praise in ways adults can underestimate. Studies in developmental psychology show that children who receive precise, sincere compliments show increased confidence, greater willingness to try unfamiliar tasks, and stronger resilience when they hit obstacles.
The mechanism is again the striatum. When a child hears “You kept going even when it got hard,” the reward system processes the message and encodes the behaviour as worth repeating. The compliment becomes a rehearsal for the trait.
Generic praise (“You’re so smart!”) produces a different and often counterproductive result. Children praised for intelligence rather than effort become more likely to avoid challenges that might threaten that label. Specific behavioural compliments, by contrast, build the process, not the fixed identity.
Between strangers
The hardest version of giving compliments is also, for many people, the most immediately affecting.
When a stranger pauses to say “Those earrings looks so nice. Where did you find them?”, something small breaks open. The person being spoken to stops being background. They become seen, and people who feel noticed are more likely to pass the impulse along. One exchange in a queue can ripple through several interactions that day.
This isn’t sentimentality. It’s the reciprocity dynamic that psychologists call social contagion. Genuine praise changes the social environment slightly, and that change propagates.
The compliment habit you can build
The most useful frame for using compliments is with attention training.
When you commit to noticing something specific you appreciate about every person you interact with over a day the noticing itself changes. You begin filtering your perception toward the positive. The colleague who interrupted you three times in the morning becomes, later, the person whose energy got the room moving. You see both things, but you’re choosing where to spend your attention.
This is the mechanism behind the drive-through story. When Julia began complimenting customers she wasn’t changing them. She was training herself to look differently at people who hadn’t changed at all. And because attention shapes mood more than circumstance does, her day changed.
A practical starting point is one genuine, specific compliment per interaction. Not every interaction. Just the ones where you notice something and usually let it pass. The noticing was already there. The habit is in saying it out loud.
Authenticity carries most of the weight. Generic, reflexive praise fades quickly. Compliments tied to something specific and observable, a decision someone made, a detail in their work, a way they handled a conversation, are processed more deeply by both the giver and the receiver.
The ripple you don’t see
One thing the neuroscience can’t track is what happens after the person leaves.
But behavioural research gives a reasonable picture. People tend to tell others about positive interactions that surprised them. A compliment from an unexpected source, a stranger or someone you assumed hadn’t noticed, travels further than one from someone whose approval was expected. It gets retold. It surfaces during a hard afternoon.
A compliment tends to make the recipient more likely to act generously toward someone else. The chain is loose and uncontrolled, but it’s real. One specific, sincere observation, offered without expectation, can change the tone of three or four subsequent interactions in someone else’s day.
That’s a high return on a sentence.
The bottom line
The resistance most people feel before giving a compliment is, according to the research, a remarkably poor guide to what will happen. The fear of awkwardness is overestimated. The impact on the recipient is underestimated. And the effect on your own mood is essentially guaranteed. Starting with one specific, genuine observation per day is enough to build the habit and the habit, compounded, builds something harder to name but easier to feel. A different relationship with the people moving through your day.
Frequently asked questions
Specificity is the key variable. Compliments tied to an observable behaviour or detail — “The way you reframed that question changed the whole meeting” — are processed more deeply than vague praise like “You did great.” The recipient can’t argue with a specific observation, and it signals that you were genuinely paying attention rather than performing kindness.
Yes, and this is well-documented. Cornell researcher Vanessa Bohns found that compliment-givers reported a better mood after delivering praise and said they were more likely to do it again. The act triggers dopamine release in the giver, not just the receiver, making it one of the few social behaviours that reliably benefits both people.
Less awkward than you expect. Bohns’s research showed that people dramatically overestimate how uncomfortable strangers will feel when complimented. Most recipients feel seen and appreciated, not bothered. The anxiety is real, but it’s a poor predictor of the actual interaction. Clumsy delivery matters far less than most givers assume.
Flattery is designed to get something. A compliment is an observation offered without an agenda. The distinction is usually felt by the recipient. Flattery often arrives before a request, while genuine praise tends to be specific and unprompted. Authenticity is what carries the neurological weight; the brain registers insincerity and discounts it quickly.
It can, and there’s a documented mechanism for why. When you look for something specific to appreciate in each person you interact with, you’re actively retraining your attentional filter. Over time, this shifts the baseline of what you notice. The work conditions don’t change, but your perception of the people in them does, which is a large portion of what work actually feels like day to day.
Not quite. In-person praise is processed more strongly than digital feedback. Face-to-face compliments carry tone, timing, and eye contact, signals the brain uses to verify sincerity. A written compliment is still meaningful, particularly when specific and unexpected, but the neurological response to the spoken word, delivered in the same room, is measurably stronger.
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